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The aeration of the activated sludge tank of wastewater treatment plant (WWTP) Westpoort in Amsterdam (the Netherlands) has been optimised using model based control. Discharge limits for the effluent of the treatment plant require total nitrogen (Ntot) concentrations below 10 mg/l. Ntot levels are reduced using biological nitrification-denitrification. This process is controlled by aeration which consumes a lot of energy. In order to reduce energy, the nitrification-denitrification process is optimised using a non linear regression model for the ammonium (NH4) concentration. Simulation results show that the total nitrogen concentration in the effluent can be decreased with a lower oxygen concentration, thus consuming less energy. Both nitrogen removal and energy consumption were reduced with ten percent. Currently, the model based control (MBC) is implemented in the actual process control.
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